Rendy Devara
This is a bitbang library for WS2812. I test it with STM32F411RE (Nucleo 441RE). If you want to use another board, u need to adjust the sum of asm("nop"). In the example program i put some code to measure how many asm("nop") do we need. See more detail about WS2812 timing https://cdn-shop.adafruit.com/datasheets/WS2812.pdf
Dependents: STM32FC_RGB_WS2812
Diff: WS2812.cpp
- Revision:
- 0:f080cb888db6
- Child:
- 1:8910a1fcbdb0
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/WS2812.cpp Sat Dec 10 08:18:58 2016 +0000
@@ -0,0 +1,250 @@
+#include "WS2812.h"
+
+
+WS2812::WS2812(PinName pin, int qty):dataOut(pin)
+{
+ dataPin = pin;
+ LED_Qty = qty;
+}
+WS2812::~WS2812()
+{
+
+}
+void WS2812::sendReset()
+{
+ dataOut = 0;
+ wait_us(60);
+}
+void WS2812::writeColor(uint32_t RGB)
+{
+ Red = ((RGB&0xFF0000)>>16);
+ Green = ((RGB&0xFF00)>>8);
+ Blue = (RGB&0xFF);
+
+ writeByte(Green);
+ writeByte(Red);
+ writeByte(Blue);
+
+}
+void WS2812::send0()
+{
+ dataOut = 1;
+ //asm("nop");
+// asm("nop");
+// asm("nop");
+
+//--------------hitung manual
+ asm("nop");
+ asm("nop");
+ asm("nop");
+ asm("nop");
+ asm("nop");
+ asm("nop");
+ asm("nop");
+ dataOut = 0;
+ //asm("nop");
+// asm("nop");
+// asm("nop");
+// asm("nop");
+// asm("nop");
+// asm("nop");
+//
+// asm("nop");
+// asm("nop");
+// asm("nop");
+
+//-----------------hitung manual
+ asm("nop");
+ asm("nop");
+ asm("nop");
+ asm("nop");
+ asm("nop");
+
+ asm("nop");
+ asm("nop");
+ asm("nop");
+ asm("nop");
+ asm("nop");
+
+ asm("nop");
+ asm("nop");
+ asm("nop");
+ asm("nop");
+ asm("nop");
+
+ asm("nop");
+ asm("nop");
+ asm("nop");
+ asm("nop");
+ asm("nop");
+
+ asm("nop");
+ asm("nop");
+ asm("nop");
+ asm("nop");
+ asm("nop");
+
+ asm("nop");
+ asm("nop");
+ asm("nop");
+ asm("nop");
+ asm("nop");
+
+ asm("nop");
+ asm("nop");
+ asm("nop");
+ asm("nop");
+ asm("nop");
+
+ asm("nop");
+ asm("nop");
+ asm("nop");
+ asm("nop");
+ asm("nop");
+ asm("nop");
+ asm("nop");
+ asm("nop");
+ asm("nop");
+ asm("nop");
+
+ asm("nop");
+ asm("nop");
+ asm("nop");
+ asm("nop");
+ asm("nop");
+
+ asm("nop");
+ asm("nop");
+ asm("nop");
+}
+void WS2812::send1()
+{
+ dataOut = 1;
+ //asm("nop");
+// asm("nop");
+// asm("nop");
+// asm("nop");
+//
+// asm("nop");
+// asm("nop");
+// asm("nop");
+//-----------------------------------
+ asm("nop");
+ asm("nop");
+ asm("nop");
+ asm("nop");
+ asm("nop");
+
+ asm("nop");
+ asm("nop");
+ asm("nop");
+ asm("nop");
+ asm("nop");
+
+ asm("nop");
+ asm("nop");
+ asm("nop");
+ asm("nop");
+ asm("nop");
+
+ asm("nop");
+ asm("nop");
+ asm("nop");
+ asm("nop");
+ asm("nop");
+
+ asm("nop");
+ asm("nop");
+ asm("nop");
+ asm("nop");
+ asm("nop");
+
+ asm("nop");
+ asm("nop");
+ asm("nop");
+ asm("nop");
+ asm("nop");
+
+ asm("nop");
+ asm("nop");
+ asm("nop");
+ asm("nop");
+ asm("nop");
+
+ asm("nop");
+ asm("nop");
+ asm("nop");
+ asm("nop");
+ asm("nop");
+ dataOut = 0;
+ // asm("nop");
+// asm("nop");
+// asm("nop");
+//
+// asm("nop");
+// asm("nop");
+// asm("nop");
+//-----------------hitung manual
+ asm("nop");
+ asm("nop");
+ asm("nop");
+ asm("nop");
+ asm("nop");
+
+ asm("nop");
+ asm("nop");
+ asm("nop");
+ asm("nop");
+ asm("nop");
+
+ asm("nop");
+ asm("nop");
+ asm("nop");
+ asm("nop");
+ asm("nop");
+
+ asm("nop");
+ asm("nop");
+ asm("nop");
+ asm("nop");
+ asm("nop");
+
+ asm("nop");
+ asm("nop");
+ asm("nop");
+ asm("nop");
+ asm("nop");
+
+ asm("nop");
+ asm("nop");
+ asm("nop");
+ asm("nop");
+ asm("nop");
+
+ asm("nop");
+ asm("nop");
+ asm("nop");
+ asm("nop");
+ asm("nop");
+}
+void WS2812::writeByte(uint8_t data)
+{
+ for(int x=7;x>=0;x--)
+ {
+ if(data&(1<<x))
+ {
+ //bit is high
+ send1();
+ }
+ else
+ {
+ //bit is low
+ send0();
+ }
+ }
+}
+void WS2812::send1Color(uint32_t RGB)
+{
+ writeColor(RGB);
+ sendReset();
+}
\ No newline at end of file